不同立地类型大果沙棘生长及生态适应对策差异

Difference in Growth Status and Ecological Adaptability Strategy of Large-Fruit Seabuckthorn under Different Site Conditions

在高速公路阳向边坡、阴向边坡和平整带引种大果沙棘,对其生长和生态适应状况进行比较研究。结果表明,营养生长和生物量积累以平整带最好,阴坡居中,阳坡最差;克隆繁殖能力以阳坡最高,阴坡居中,平整带最小。在阳坡种群以合轴型分株为主,将更多的生物量分配于垂直根系,子株数量多但植株矮小;在平整带种群以单轴型分株为主,水平根较发达,子株数量少但植株高大。

Large-fruit seabuckthorn was introduced to grow along highway on the sunny slope, shady slope and the leveled belt to study the growth difference and ecological strategy of the species under different site conditions. The results showed that the plants growing in the leveled belt had the best vegetative growth and biomass accumulation, followed by the plants growing on the shady and sunny slopes. Regarding to clonal propagation capacity, the order of site conditions was the sunny slope, shady slope and the leveled belt. It was found out that there were different propagation strategies for the plants growing in different site conditions. The propagation pattern for the plants on the sunny slope was mainly the sympodial dividing to allocate more biomass to vertical root system, which was characterized with more daughter ramets in small size. Whereas the propagation pattern on the leveled belt was mainly the monopodial dividing to allocate more biomass to propagation organs that was characterized with strong lateral root system, less daughter ramets in large size.